https://ukandeu.ac.uk/what-sunaks-tax-return-tells-us-about-the-uk-tax-system/
https://www.imk-boeckler.de/download-proxy-for-faust/download-pdf?url=http%3A%2F%2F217.89.182.78%3A451%2Fabfrage_digi.fau%2Fp_imk_report_159e_2020.pdf%3Fprj%3Dhbs-abfrage%26ab_dm%3D1%26ab_zeig%3D8946%26ab_diginr%3D8482
https://scholar.harvard.edu/files/rogoff/files/nber26760_why_is_euro_punching_below_its_weight.pdf
https://www.raadvanstate.nl/publicaties/publicaties.html